#include<bits/stdc++.h>
#define ll long long
#define ull unsigned long long
using namespace std;

const int N = 1e6 + 10, INF = 0x3f3f3f3f;

void solve()
{
    int x, y, a, b;
    scanf("%d%d%d%d", &x, &y, &a, &b);

    int dx = abs(x - a), dy = abs(y - b);

    if (dx < dy) swap(dx, dy);
    int ans = dx / 2 + dx % 2;
    if (x == a || y == b) {
        if (ans & 1) printf("%d\n", ans + 1);
        else printf("%d\n", ans);
    } else printf("%d\n", ans);
}

signed main()
{
    // ios::sync_with_stdio(0);
    // cin.tie(0);cout.tie(0);
#define ONLINE_JUDGE
#ifndef ONLINE_JUDGE
    std::istringstream in(R"()");
    std::cin.rdbuf(in.rdbuf());
#endif
    int T = 1;
    cin >> T;
    for (int i = 1;i <= T;i++) {
        solve();
    }
}